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You can test your SQL skills with W3Schools' Exercises. Exercises. We have gathered a variety of SQL exercises (with answers) for each SQL Chapter. Try to solve an exercise by filling in the missing parts of a code. If you're stuck, hit the "Show Answer" button to see what you've done wrong. Count Your Score.
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May 29, 2024 · Explore over 100 SQL interview questions and exercises. Get preparation tips and confidently tackle your SQL interview.
- Agnieszka Kozubek-Krycuń
- SQL Interview Questions at A Glance
- General SQL Interview Questions For Beginners
- Technical SQL Interview Questions For Beginners
- 40 Top Intermediate SQL Interview Questions and Answers
- Conclusion
Throughout this article, we'll explore a range of SQL interview questions and answers for practitioners at the beginner and intermediate levels. If you're looking for an overview, we've compiled some top tips below:
To kick off, before asking you technical questions, your interviewer may ask you some general questions about your overall experience with SQL. You can expect the following questions: 1. What SQL flavors are you familiar with? 2. How can you estimate your level of proficiency in SQL? 3. For how long have you been working in SQL? While this informat...
Now, let's move on to the technical SQL interview questions and some potential answers to them. When answering technical questions, the best strategy is to give as precise answers as possible. It may look like an attempt to deviate from the main topic. In addition, it may provocate additional questions about which you can feel less confident.
In this section, we take a look at the 40 most popular intermediate SQL questions and answers, so that you'll know what to expect from your interviewer. These questions are more suited to SQL practitioners with a few years of experience.
To sum up, we discussed the 80 essential beginner and intermediate SQL interview questions and the right answers to them. Hopefully, this information will help you to get ready for the interview and feel more confident, whether you're looking for a job in SQL or hiring candidates for an intermediate SQL position. If you feel that you need more trai...
- What is SQL? SQL stands for Structured Query Language. It is a language used to interact with the database, i.e to create a database, to create a table in the database, to retrieve data or update a table in the database etc.
- What is a Database? A Database is defined as a structured form of data which is stored in a computer or data in an organised manner and can be accessed in various ways.
- Does SQL support programming language features ? It is true that SQL is a language but it does not support programming as it is not a programming language, it is a command language.
- What are the differences between SQL and PL/SQL? Ans: Some common differences between SQL and PL/SQL are as shown below: SQL. PL/SQL. SQL is a query execution or commanding language.
- What Is a JOIN in SQL? JOIN is an SQL command that allows you to combine two or more tables. This is done via a common column (i.e. a column that has the same values in both tables), which allows using data from two or more tables at the same time.
- What Is the Difference Between INNER JOIN, LEFT JOIN, RIGHT JOIN, and FULL JOIN? There are different types of joins in SQL. The most commonly used joins are INNER JOIN, LEFT JOIN, RIGHT JOIN, and FULL JOIN.
- What Is a CROSS JOIN? A CROSS JOIN is another join type available in SQL. It returns a Cartesian product. This means that CROSS JOIN will return each row from the first table combined with each row from the second table.
- What Is a Self-Join in SQL? As you probably suspect, a self-join occurs when the table is joined with itself. It’s important to note that it’s not a distinct command in SQL: any JOIN type can be used to join a table with itself.
Mar 14, 2017 · Your interviewer may use several kinds of SQL whiteboard questions: sometimes you’ll be asked to describe the differences between two elements; sometimes you’ll have to tell them the result of a specific query; you may even have to write some simple code. This sounds stressful, but don’t worry too much.
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Submit Answer Show Answer Hide Answer. Go to w3schools.com. Reset Score. Close This Menu . SQL Select . Exercise 1 Exercise 2 Exercise 3 Go to SQL Select Tutorial.
